Lead isotope ratio of bronze artifacts excavated from Dongchon Site in Sunchang have determined by TIMS. As results of comparison lead isotope ratio of bronze objects with the provenance data of galenas of Korea, China, and Japan, the provenance of three material of bronze objects were turned out to originate from the southern and northern part of China. On the other hands, data were plotted either in zone 3 of the South Korean galena map. The results of these scientific analysis of bronze objects can be used as basic data in comparison researches on manufacturing technology, provenance of bronze objects to be found in the future.